Sleeves for 6mm SWA

[Dbru]

Hi there, I have a 6mm 3 core SWA running to the garage and need to sleeve both the black cable (earth I think) and grey (neutral I think).
The wires look like being 4mm in diameter so am right in simply saying I need to buy 5-6mm sleeves?
Cheers

 

[EFLImpudence]

Yes, the sleeve sizes are diameters.

 

[Taylortwocities]

The cable sizes are the cross sectional area of each of the copper conductors.
Properly stated, your cable is 6mm².